HANDLING HOG CHOLEKA IN THE FIELD 187 



them a second time before they are placed with 

 susceptible hogs, and where there are facilities 

 for isolating them two weeks after they return 

 this should be done as an additional precaution. 

 We must not lose sight of the fact that even an 

 immune hog can become the intermediate carrier 

 of hog cholera virus. 



Should a ' ' break " appear when the show hogs 

 are immunized it should be handled according 

 to the plan previously outlined, and as an addi- 

 tional precaution, the entire herd had best be pro- 

 tected with serum. In any event, when the hogs 

 leave the quarters in which they are placed for 

 simultaneous treatment, the pens should be care- 

 fully disinfected. 



When no virus is to be used in treating the show 

 animals they require serum alone at the time 

 they leave home, and thereafter every three weeks 

 as long as they are on the road. After they re- 

 turn it is well to isolate them two weeks, after 

 which they may be dipped in antiseptic solution 

 and placed with the remainder of the herd. 



On the whole, a breeder who habitually places 

 hogs in the show ring should maintain his entire 

 herd immune to hog cholera. Under most cir- 

 cumstances, when this is not done the use of serum 

 alone for temporary protection is indicated, but 

 under exceptional conditions, where perfect seg- 

 regation is possible simultaneous treatment may 



